Recipe Preparation

Whisk oyster sauce, soy sauce, vinegar, and 1/4 cup water in a small bowl; set sauce aside.

Heat 2 tablespoons oil in a large skillet over medium-high heat. Add brussels sprouts and cook, tossing occasionally, until golden brown, about 4 minutes. Cover and cook until crisp-tender, about 3 minutes longer. Transfer to a plate; wipe out skillet.

Season steak with salt. Heat 1 tablespoon oil in same skillet over high heat until just beginning to smoke. Add steak in a single layer; cook until browned, about 3 minutes. Turn and cook until nearly cooked through, about 30 seconds. Add to brussels sprouts.